Koji Ashida

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Creating a complex virtual environment with human inhabitants that behave as we would expect real humans to behave is a difficult and time consuming task. Time must be spent to construct the environment, to create human figures, to create animations for the agents' actions, and to create controls for the agents' behaviors, such as scripts, plans, and(More)
We describe an algorithm to generate a manifold mesh from an octree while preserving surface features. The algorithm requires samples of a surface (coordinates) on the octree edges, along with the surface normals at those coordinates.The distinct features of the algorithm are:<ul><li>the output mesh is manifold,</li><li>the resolution of the output mesh can(More)
Micro mechanical fabrication is one of practical manufacturing technologies for small and precise products and devices. It mainly covers mesoscopic region between 10 microns and 1 mm. Near the lower limit of the region, it is believed silicon-based technologies are the most efficient processes and mechanical fabrication can be applied only to one-off(More)
To m y grandparents Nicole de March eville and Ren e Erignac. iii Acknowledgements I would like to thank my advisor, Norman Badler, for giving me the opportunity to do a Ph.D. under his direction. I am quite fortunate indeed, for he let me choose my topic freely, and provided unconditional moral and nancial support. Since it takes a whole lab to do a Ph.D.(More)
We develop a bulk silver tip for tip-enhanced Raman scattering (TERS) and obtain TERS spectra of epitaxial graphene on the carbon face of 4H-SiC(000-1) with a high signal-to-noise ratio. Thanks to the high quality of TERS spectra we firstly find that the G band in the TERS spectra exhibits position-by-position variations in both lower wavenumber shifts and(More)
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